灌漑要求水量(IWR)・降水量・NDVIの年々変動に関する相関分析

Abstract

灌漑の効果を考慮できる陸面過程モデルSiBUC (Simple Biosphere including Urban Canopy) を用いて全球土壌水分プロジェクトに参加し，全球陸面水文諸量の算出を行った。得られた陸面再解析データから，灌漑要求水量と降水量，NDVI と降水量の相関分析をそれぞれ行った。その結果，2 つの相関分析の結果を合わせると，灌漑能力に関する情報を抽出しうることが明らかとなった。

The SiBUC (Simple Biosphere including Urban Canopy) land surface scheme which has irrigation scheme is one of participants of the GSWP2 (the 2nd Global SoilWetness Project). Accordingly, global 10-year simulation considering irrigation was implemented, and global distribution of IWR (Irrigation Water Requirement) was estimated. From the analysis of two correlation coefficients (cc1: between precipitation and IWR, cc2: between precipitation and NDVI), it was found that not only regions where cc1 is negative and cc2 is neutral but also regions where both cc1 and cc2 are positive exist. It can be implied that this difference of correlation expresses whether the irrigation facilities are adequate or not.